CN115619189B - Water discarding scheduling method and device considering cascade hydroelectric water discarding flow limit - Google Patents
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Abstract
The application relates to the technical field of power system resource scheduling, and provides a water discarding scheduling method and device considering cascade water and electricity water discarding flow limit, wherein the method comprises the following steps: under the premise of considering the cascade hydroelectric waste water flow limit and a preset decision variable, a waste water scheduling model is constructed; establishing an objective function of the water discarding scheduling model based on the multidimensional hydroelectric objective demand parameters; determining constraint conditions of the water discarding scheduling model by taking reservoir capacity balance and water discarding requirements of the cascade hydroelectric units as targets; acquiring system load balance demand data, unit data, power plant data and step hydropower unit data as input data of the water discarding scheduling model; and solving the water discarding scheduling model based on the input data to obtain a water discarding scheduling result considering the cascade hydroelectric water discarding flow limit. The application can efficiently and reasonably carry out the water discarding scheduling of the step hydropower under the premise of considering the limitation of the water discarding flow of the step hydropower.
Description
Technical Field
The application relates to the technical field of power system resource scheduling, in particular to a water discarding scheduling method and device considering cascade hydroelectric water discarding flow limit.
Background
The cascade hydropower station is a main form for utilizing water resources in most areas in China.
However, at present, most cascade hydropower stations still widely adopt a forced water discarding strategy, and when situations of mismatching of electric loads, mismatching of construction of an outgoing channel and power generation capacity, too low actual capacity of a transformer substation and the like are encountered, the water conservancy resources are often difficult to fully and reasonably utilize.
Disclosure of Invention
In view of the above, it is necessary to provide a water waste scheduling method and apparatus that take into account cascade hydroelectric water waste flow restrictions.
In a first aspect, the application provides a water discard scheduling method considering cascade hydroelectric water discard flow limitation. The method comprises the following steps:
under the premise of considering the cascade hydroelectric waste water flow limit and a preset decision variable, a waste water scheduling model is constructed;
establishing an objective function of the water discarding scheduling model based on the multidimensional hydroelectric objective demand parameters;
determining constraint conditions of the water discarding scheduling model by taking reservoir capacity balance and water discarding requirements of the cascade hydroelectric units as targets;
acquiring system load balance demand data, unit data, power plant data and step hydropower unit data as input data of the water discarding scheduling model;
And solving the water discarding scheduling model based on the input data to obtain a water discarding scheduling result considering the cascade hydroelectric water discarding flow limit.
In one embodiment, the multidimensional hydropower objective demand parameter includes a total online purchase electricity cost demand parameter, a grid safe operation demand parameter, and a clean energy consumption demand parameter; the total online shopping cost demand parameters comprise parameters for representing the minimization of the total online shopping cost; the clean energy consumption requirement parameters comprise parameters for representing a clean energy consumption target; the water discarding scheduling model comprises a safety constraint unit combination model; the establishing the objective function of the water discarding scheduling model based on the multi-dimensional hydroelectric objective demand parameters comprises the following steps:
on the premise of meeting the requirements of the minimization of the total online shopping cost and the safe operation of the power grid and achieving the clean energy consumption target, the following expression is adopted to establish an objective function of the safe constraint unit combination model:
wherein N is the total number of units; j is the total number of the step hydroelectric units; t is the total number of time periods to be considered; p (P) i，t The output of the unit i in the period t; c (C) i，t (P i，t ) The method comprises the steps of providing running cost of a unit i in a period t, wherein the running cost is a multi-section linear function related to each section of output interval and corresponding energy price declared by the unit; The starting cost of the unit i in the period t is set; m is M 1 Relaxing penalty factors for network power flow constraints for water discard scheduling optimization; m is M 2 A discard electricity penalty factor for discard scheduling optimization; />Is the forward power flow relaxation variable of line l; />A reverse power flow relaxation variable of the line l; NL is the total number of lines; />Is the forward power flow relaxation variable of the section s; />Is the reverse power flow relaxation variable of the section s; NS is the total number of sections.
In one embodiment, the constraints include a hydropower level control constraint and a reject flow limit constraint; the reservoir capacity balance comprises reservoir water quantity dynamic balance; the step hydroelectric unit water discarding requirement comprises the actual water discarding habit of the step hydroelectric unit; the constraint condition of the water discarding scheduling model is determined by taking reservoir capacity balance and cascade hydroelectric unit water discarding requirements as targets, and the constraint condition comprises the following steps:
determining a hydropower level control constraint condition of the water discarding scheduling model by taking the dynamic balance of the reservoir water quantity as a target;
and determining the water discarding flow limit constraint condition of the water discarding scheduling model by taking the actual water discarding habit of the step hydroelectric unit as a target.
In one embodiment, the determining the hydropower level control constraint condition of the water abandon scheduling model by taking the dynamic balance of the reservoir water quantity as a target includes:
And determining a hydropower level control constraint condition of the water discarding scheduling model by taking the dynamic balance of the reservoir water quantity as a target and adopting the following expression:
wherein,a lower limit of the water level control requirement of the step hydroelectric unit i at the end of the period t, which is determined by the water regulation; />The upper limit of the water level control requirement of the step hydroelectric unit i at the end of the period t is determined by water regulation; z is Z i，0 For step hydropowerThe initial water level of the unit i at the zero point of the next day; i i，τ The natural inflow water flow of the step hydroelectric unit i in the period tau is obtained; up (i) represents the upstream step hydropower unit of the step hydropower unit i; s (i) represents the upstream lag time faced by the step hydroelectric unit i;generating flow for the upstream step hydropower unit up (i) of the step hydropower unit i in the period t-s (i);the reject flow for the upstream step hydropower unit up (i) of the step hydropower unit i in the period t-s (i).
In one embodiment, the determining the constraint condition of the water-discarding flow rate of the water-discarding scheduling model with the objective of conforming to the actual water-discarding habit of the step hydroelectric unit includes:
and determining a water discarding flow limit constraint condition of the water discarding scheduling model by taking the actual water discarding habit of the step hydroelectric unit as a target and adopting the following expression:
Wherein Z is i，t，end For the water level of the step hydroelectric unit i at the end of the period t,the upper limit of the water level control requirement of the step hydroelectric unit i at the end of the period t is determined by water regulation; />The water flow rate of the step hydroelectric unit i in the period t is obtained; beta i，t Represents an integer variable with a value of 0 or 1, when beta i，t When=1, the flow rate of the waste water which is allowed to be generated by the step hydroelectric unit i in the period t is represented as beta i，t When=0, the water flow rate of the step hydroelectric unit i is 0 in the period t; m is any extremely positive number.
In one embodiment, the step hydropower unit data comprises a step hydropower unit data table; the water disposal dispatching result comprises a system load balance table, a unit winning power table, a power plant winning power schedule and a cascade hydroelectric unit water disposal table.
In a second aspect, the application further provides a water discarding scheduling device considering cascade hydroelectric water discarding flow limit. The device comprises:
the scheduling model construction module is used for constructing a water discarding scheduling model under the premise of considering the cascade hydroelectric water discarding flow limit and a preset decision variable;
the objective function building module is used for building an objective function of the water discarding scheduling model based on the multidimensional hydropower objective demand parameters;
The constraint condition determining module is used for determining constraint conditions of the water discarding scheduling model by taking reservoir capacity balance and water discarding requirements of the step hydroelectric units as targets;
the input data acquisition module is used for acquiring system load balance demand data, unit data, power plant data and step hydropower unit data and is used as input data of the water discarding scheduling model;
and the scheduling result output module is used for solving the water-discarding scheduling model based on the input data to obtain a water-discarding scheduling result considering the cascade hydroelectric water-discarding flow limit.
In a third aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor which when executing the computer program performs the steps of:
under the premise of considering the cascade hydroelectric waste water flow limit and a preset decision variable, a waste water scheduling model is constructed; establishing an objective function of the water discarding scheduling model based on the multidimensional hydroelectric objective demand parameters; determining constraint conditions of the water discarding scheduling model by taking reservoir capacity balance and water discarding requirements of the cascade hydroelectric units as targets; acquiring system load balance demand data, unit data, power plant data and step hydropower unit data as input data of the water discarding scheduling model; and solving the water discarding scheduling model based on the input data to obtain a water discarding scheduling result considering the cascade hydroelectric water discarding flow limit.
In a fourth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
under the premise of considering the cascade hydroelectric waste water flow limit and a preset decision variable, a waste water scheduling model is constructed; establishing an objective function of the water discarding scheduling model based on the multidimensional hydroelectric objective demand parameters; determining constraint conditions of the water discarding scheduling model by taking reservoir capacity balance and water discarding requirements of the cascade hydroelectric units as targets; acquiring system load balance demand data, unit data, power plant data and step hydropower unit data as input data of the water discarding scheduling model; and solving the water discarding scheduling model based on the input data to obtain a water discarding scheduling result considering the cascade hydroelectric water discarding flow limit.
In a fifth aspect, the present application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of:
under the premise of considering the cascade hydroelectric waste water flow limit and a preset decision variable, a waste water scheduling model is constructed; establishing an objective function of the water discarding scheduling model based on the multidimensional hydroelectric objective demand parameters; determining constraint conditions of the water discarding scheduling model by taking reservoir capacity balance and water discarding requirements of the cascade hydroelectric units as targets; acquiring system load balance demand data, unit data, power plant data and step hydropower unit data as input data of the water discarding scheduling model; and solving the water discarding scheduling model based on the input data to obtain a water discarding scheduling result considering the cascade hydroelectric water discarding flow limit.
According to the water discarding scheduling method and device considering the cascade hydroelectric water discarding flow limit, firstly, a water discarding scheduling model is constructed under the premise of considering the cascade hydroelectric water discarding flow limit and a preset decision variable. And then, establishing an objective function of the water discarding scheduling model based on the multidimensional hydropower objective demand parameters. And then, determining constraint conditions of a water discarding scheduling model by taking reservoir capacity balance and water discarding requirements of the step hydroelectric units as targets. And then, acquiring system load balance demand data, unit data, power plant data and step hydropower unit data as input data of a water discarding scheduling model. And finally, solving the water discarding scheduling model based on the input data to obtain a water discarding scheduling result considering the cascade hydroelectric water discarding flow limit. According to the application, by constructing the water discarding scheduling model with the hydropower level control constraint condition and the water discarding flow limit constraint condition, the water discarding scheduling scheme of the cascade hydropower unit can more accord with the actual water discarding habit of the cascade hydropower unit, so that the cascade hydropower unit can generate water discarding only when the water level reaches the upper limit of the corresponding water level of the reservoir capacity, the water discarding scheduling efficiency of the cascade hydropower unit is improved, and the cascade hydropower unit can fully and reasonably utilize water resources.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is an application environment diagram of a reject scheduling method that takes into account cascade water reject flow limitation in one embodiment;
FIG. 2 is a flow diagram of a reject scheduling method that accounts for cascade water reject flow restriction in one embodiment;
FIG. 3 is a flow diagram of a particular manner in which constraints of a water reject scheduling model are determined in one embodiment;
FIG. 4 is a block diagram of a water reject scheduler that takes into account cascade water reject flow limitation in one embodiment;
fig. 5 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The water discarding scheduling method considering cascade hydroelectric water discarding flow limit provided by the embodiment of the application can be applied to an application environment shown in figure 1.
Wherein the terminal 102 communicates with the server 104 via a network. The data storage system may store data that the server 104 needs to process. The data storage system may be integrated on the server 104 or may be located on a cloud or other network server.
Specifically, the terminal 102 may be, but is not limited to, various personal computers, notebook computers, and tablet computers; the server 104 may be implemented as a stand-alone server or as a server cluster of multiple servers.
In one embodiment, as shown in fig. 2, a water-discarding scheduling method considering cascade water-electricity water-discarding flow limitation is provided, and the method is applied to the server in fig. 1 for illustration, and includes the following steps:
step S210, under the premise of considering cascade hydroelectric waste water flow limit and preset decision variables, a waste water scheduling model is constructed.
In the step, the step hydropower waste water flow limit refers to the waste water flow limit of the step hydropower unit; the preset decision variables are used for constructing a water discarding scheduling model and can comprise characterization step hydroelectric units; the water-discarding scheduling model can be used for limiting the step hydroelectric unit to generate water-discarding only when the water level reaches the upper limit of the water level corresponding to the reservoir capacity.
In practical applications, the preset decision variables of the water-discarding scheduling model may include the output power P of the step hydroelectric unit i in each period t i,t Flow rate of electricity generationReject flow->
Furthermore, on the premise of adopting the decision variables to construct the water-discarding scheduling model, the following assumptions can be made:
firstly, in the period of clear day before, the water consumption rate of the cascade hydroelectric unit is unchanged, and the power generation flow rate is unchangedAnd output power P i,t The relation between the water consumption rate parameters h i To represent.
Secondly, in the day-ahead clear period, a linear relationship exists between the water level and the water storage capacity of the cascade hydroelectric unit, namely the water surface area S of the reservoir i Is unchanged.
In addition, the delay time between each step hydropower unit in the day before is irrelevant to the lower drainage flow of the upper-level hydropower unit.
Step S220, based on the multidimensional hydropower target demand parameters, an objective function of a water discarding scheduling model is established.
In the step, the multi-dimensional hydroelectric target demand parameters refer to various parameters representing the multi-dimensional hydroelectric target demand of the water discarding scheduling model; the objective function of the water-discarding scheduling model is established based on the multidimensional hydroelectric objective demand parameters.
And step S230, determining constraint conditions of a water discarding scheduling model by taking reservoir capacity balance and cascade hydroelectric unit water discarding requirements as targets.
In the step, the balance of the reservoir capacity means that the water level of the reservoir is not higher than the upper limit of the water level and not lower than the lower limit of the water level, and when the current water level of the reservoir is higher than the upper limit of the water level, water is discarded according to the situation so as to ensure the safety of reservoir dispatching; the step hydroelectric unit water discarding requirement refers to that under the premise of meeting the actual water discarding habit of the step hydroelectric unit, the restriction of the step hydroelectric water discarding flow is considered, namely, the water discarding flow is allowed to be generated only when the water level of the step hydroelectric unit reaches the upper limit of the corresponding water level of the reservoir capacity (or the upper limit of the water level appointed by the water adjustment); constraint conditions of the water discarding scheduling model refer to constraint conditions of the water discarding scheduling model determined based on reservoir capacity balance and water discarding requirements of the cascade hydroelectric units; the number of constraint conditions of the water-discarding scheduling model and the number of constraint targets of the water-discarding scheduling model can be in one-to-one correspondence.
And step S240, acquiring system load balance demand data, unit data, power plant data and step hydropower unit data as input data of a water discarding scheduling model.
In this step, the system load balancing requirement data may include requirement data such as period information, system load prediction data, and system standby requirement data; the unit data can comprise unit data such as a unit basic information table, a unit calculation parameter table, a unit starting quotation table, a unit energy quotation table, a unit initial state table, a unit designated state table, a unit electric power constraint table, a unit standby constraint table, a unit electric quantity constraint table, a unit adjustment capacity table and the like; the power plant data can comprise power plant data such as a power plant basic meter, power plant calculation parameters, a power plant power constraint meter, a power plant electric quantity constraint meter and the like; the step hydroelectric unit data can comprise hydroelectric unit data such as a hydroelectric unit step relation table, a hydroelectric unit reservoir capacity water level parameter table, a hydroelectric unit history state table, a hydroelectric unit water level constraint table and the like.
In practical application, the specific form of the input data of the water-discarding scheduling model can be defined by defining a standardized input interface in the water-discarding scheduling model.
And step S250, solving the water discarding scheduling model based on the input data to obtain a water discarding scheduling result considering the cascade hydroelectric water discarding flow limit.
In the step, input data refers to input data of a water discarding scheduling model, wherein the input data comprises system load balance demand data, unit data, power plant data and step hydropower unit data; solving the water-discarding scheduling model based on the input data refers to obtaining an output value of the water-discarding scheduling model corresponding to the input data of the water-discarding scheduling model.
In practical application, the water discarding scheduling result of cascade hydroelectric water discarding flow limit is considered, and the standard output interface is defined in the water discarding scheduling model to output.
According to the water discarding scheduling method considering the cascade hydroelectric water discarding flow limit, firstly, a water discarding scheduling model is constructed under the premise of considering the cascade hydroelectric water discarding flow limit and a preset decision variable. And then, establishing an objective function of the water discarding scheduling model based on the multidimensional hydropower objective demand parameters. And then, determining constraint conditions of a water discarding scheduling model by taking reservoir capacity balance and water discarding requirements of the step hydroelectric units as targets. And then, acquiring system load balance demand data, unit data, power plant data and step hydropower unit data as input data of a water discarding scheduling model. And finally, solving the water discarding scheduling model based on the input data to obtain a water discarding scheduling result considering the cascade hydroelectric water discarding flow limit. According to the application, by constructing the water discarding scheduling model with the hydropower level control constraint condition and the water discarding flow limit constraint condition, the water discarding scheduling scheme of the cascade hydropower unit can more accord with the actual water discarding habit of the cascade hydropower unit, so that the cascade hydropower unit can generate water discarding only when the water level reaches the upper limit of the corresponding water level of the reservoir capacity, the water discarding scheduling efficiency of the cascade hydropower unit is improved, and the cascade hydropower unit can fully and reasonably utilize water resources.
For the specific mode of establishing the objective function of the water abandon scheduling model, in one embodiment, the multi-dimensional hydroelectric objective demand parameters include a total online purchase electricity cost demand parameter, a power grid safe operation demand parameter and a clean energy consumption demand parameter; the total online shopping cost demand parameters comprise parameters for representing the minimization of the total online shopping cost; the clean energy consumption requirement parameters comprise parameters for representing a clean energy consumption target; the water discarding scheduling model comprises a safety constraint unit combination model; the step S220 specifically includes:
on the premise of meeting the requirements of minimization of the total online purchase electricity cost and safe operation of the power grid and achieving the aim of clean energy consumption, the following expression is adopted to establish the objective function of the safety constraint unit combination model:
wherein N is the total number of units; j is the total number of the step hydroelectric units; t is the total number of time periods to be considered; p (P) i，t The output of the unit i in the period t; c (C) i，t (P i，t ) The running cost of the unit i in the period t is a multi-section linear function related to each section of output interval and corresponding energy price declared by the unit;the starting cost of the unit i in the period t is set; m is M 1 Relaxing penalty factors for network power flow constraints for water discard scheduling optimization; m is M 2 A discard electricity penalty factor for discard scheduling optimization; />Is the forward power flow relaxation variable of line l; />A reverse power flow relaxation variable of the line l; NL is the total number of lines; />Is the forward power flow relaxation variable of the section s; />Is the reverse power flow relaxation variable of the section s; NS is the total number of sections.
Specifically, the safety restraint unit combination model refers to a safety-restraint unit combination (SCUC) model; network power flow constraint relaxation penalty factor M 1 And discard electric quantity penalty factor M 2 The water discharge penalty item is set in the objective function and used for ensuring clean energy consumption and is used for avoiding the generation of water discharge; the network power flow constraint of the objective function comprises a line power flow constraint and a section power flow constraint.
According to the embodiment, by means of establishing the objective function of the water discarding scheduling model, the step hydroelectric unit is ensured to generate water discarding only when the water level reaches the upper limit of the water level corresponding to the reservoir capacity, and the water discarding scheduling efficiency of the step hydroelectric unit is effectively improved.
For the specific manner in which constraints of the discard scheduling model are determined, in one embodiment, the constraints include a hydropower level control constraint and a discard flow limit constraint; the reservoir capacity balance comprises reservoir water quantity dynamic balance; the step hydroelectric unit water discarding requirement comprises the actual water discarding habit of the step hydroelectric unit; as shown in fig. 3, the step S230 specifically includes:
And step S310, determining a hydropower level control constraint condition of the water abandon scheduling model by taking dynamic balance of the reservoir water quantity as a target.
In the step, the dynamic balance of the reservoir water quantity refers to that the water abandoning scheduling result meets the requirements of the upper and lower limits of the water level of the reservoir, namely, the water level of the reservoir is ensured not to be higher than the upper limit of the water level and not to be lower than the lower limit of the water level, and when the current water level of the reservoir is higher than the upper limit of the water level, water abandoning is carried out according to the situation so as to ensure the safety of reservoir scheduling; the hydropower level control constraint condition of the water discarding scheduling model can be constructed based on a reservoir water quantity dynamic balance equation.
Step S320, determining a water discarding flow limit constraint condition of the water discarding scheduling model with the aim of conforming to the actual water discarding habit of the step hydroelectric unit.
In this step, the actual water-discarding habit of the step hydropower unit may include allowing the water-discarding flow to occur only when the water level of the hydropower unit reaches the upper limit of the water level corresponding to the reservoir capacity (or the upper limit of the water level designated by the water adjustment); the water discarding flow limiting constraint condition of the water discarding scheduling model refers to a determined water discarding flow limiting constraint condition according to the actual water discarding habit of the step hydroelectric unit.
According to the embodiment, the dynamic balance of the reservoir water quantity and the practical water discarding habit of the step hydropower unit are taken as targets, and the constraint condition of the water discarding scheduling model is determined, so that the water discarding scheduling result obtained based on the water discarding scheduling model is ensured, the reservoir water level control requirement of the step hydropower unit can be met, the practical water discarding habit of the step hydropower unit is met, and further, the step hydropower unit can be fully and reasonably utilized for water resources.
For a specific manner of determining the hydropower level control constraint condition of the water discard scheduling model, in one embodiment, the step S310 specifically includes:
the method comprises the following steps of taking dynamic balance of reservoir water quantity as a target, and determining a hydropower level control constraint condition of a water discarding scheduling model by adopting the following expression:
wherein,a lower limit of the water level control requirement of the step hydroelectric unit i at the end of the period t, which is determined by the water regulation; />Is determined by water regulationThe upper limit of the water level control requirement of the step hydroelectric unit i at the end of the period t; z is Z i，0 The initial water level of the step hydroelectric unit i at the zero point of the next day; i i，τ The natural inflow water flow of the step hydroelectric unit i in the period tau is obtained; up (i) represents the upstream step hydropower unit of the step hydropower unit i; s (i) represents the upstream lag time faced by the step hydroelectric unit i; Generating flow for the upstream step hydropower unit up (i) of the step hydropower unit i in the period t-s (i);the reject flow for the upstream step hydropower unit up (i) of the step hydropower unit i in the period t-s (i).
Specifically, the specific objective of constructing the hydropower water level control constraint condition can be to enable the water discarding scheduling result to meet the requirements of the upper and lower water level limits of the reservoir by establishing the hydropower water level control constraint, namely, ensuring that the water level of the reservoir is not higher than the upper water level limit and not lower than the lower water level limit, and discarding water according to the situation when the current water level of the reservoir is higher than the upper water level limit so as to ensure the safety of reservoir scheduling.
According to the embodiment, the hydropower level control constraint condition of the water abandon scheduling model is determined based on the reservoir water quantity dynamic balance equation, so that the water abandon scheduling result obtained based on the water abandon scheduling model is ensured, and the reservoir water level control requirement of the cascade hydropower unit can be met.
For a specific manner of determining the reject flow limitation constraint condition of the reject scheduling model, in one embodiment, the step S320 specifically includes:
aiming at conforming to the actual water discarding habit of the step hydroelectric unit, determining the water discarding flow limit constraint condition of the water discarding scheduling model by adopting the following expression:
Wherein Z is i，t，end For the water level of the step hydroelectric unit i at the end of the period t,the upper limit of the water level control requirement of the step hydroelectric unit i at the end of the period t is determined by water regulation; />The water flow rate of the step hydroelectric unit i in the period t is obtained; beta i，t Represents an integer variable with a value of 0 or 1, when beta i，t When=1, the flow rate of the waste water which is allowed to be generated by the step hydroelectric unit i in the period t is represented as beta i，t When=0, the water flow rate of the step hydroelectric unit i is 0 in the period t; m is any extremely positive number.
Specifically, the actual water-discarding habit of the step hydroelectric unit may include allowing the water-discarding flow to occur only when the water level of the hydroelectric unit reaches the upper limit of the water level corresponding to the reservoir capacity (or the upper limit of the water level designated by the water regulation).
In practical application, as the water discarding electric quantity punishment item is set in the water discarding scheduling model so as to ensure clean energy consumption, in order to ensure that the water discarding electric quantity is the lowest value and meanwhile consider the water level constraint of the hydroelectric unit, the water discarding quantity of the optimized cascade hydroelectric unit may be as follows:
in the preceding consecutive periods N, the reject flow rate of the step hydropower unit is 0. However, as the reservoir water volume gradually accumulates, the step hydroelectric unit suddenly performs large-scale water discarding when the water level thereof approaches the highest water level, causing a sudden large drop in the reservoir water level, so that the water discarding flow rate of the hydroelectric unit is 0 in the next remaining period.
The above situation obviously does not conform to the actual water-discarding habit of the hydroelectric unit, so in order to prevent the occurrence of such water-discarding scheduling result, it is necessary to consider the water-discarding flow restriction constraint of building the cascade hydropower (i.e. the water-discarding flow restriction constraint condition of the water-discarding scheduling model described above), so that the water-discarding flow is allowed to be generated only when the water level of the hydroelectric unit reaches the upper limit of the corresponding water level (or the upper limit of the water level designated by the water scheduling place) so as to satisfy the requirement of the water-electricity water level control.
According to the method, the mode of determining the water discharge flow limit constraint condition of the water discharge scheduling model by taking the actual water discharge habit of the step hydroelectric unit as a target ensures that the step hydroelectric unit can generate water discharge only when the water level reaches the upper limit of the corresponding water level of the reservoir capacity, so that the water discharge scheduling result of the step hydroelectric unit is more in accordance with the actual water discharge habit of the step hydroelectric unit, and further, the step hydroelectric unit can fully and reasonably utilize water resources.
In one embodiment, the step hydropower unit data comprises a step hydropower unit data table; the water disposal scheduling result comprises a system load balance table, a unit winning power table, a power plant winning power schedule and a cascade hydroelectric unit water disposal table.
Specifically, the system load balancing table may include period information, system active load, system active output, and other data representing system load balancing; the unit bid-winning power meter can comprise data representing unit bid-winning power such as time period information, unit state, unit active power output and the like; the winning bid output schedule of the power plant can comprise time period information, power plant active output and other data representing the winning bid output schedule of the power plant; the cascade hydroelectric unit water-discarding meter can comprise data representing the water-discarding amount of the cascade hydroelectric unit, such as time period information, water-discarding power, water-discarding flow, water level of the hydroelectric unit and the like.
Further, the system load balancing requirement data may include requirement data such as period information, system load prediction data, system standby requirement data, etc.; the unit data can comprise unit data such as a unit basic information table, a unit calculation parameter table, a unit starting quotation table, a unit energy quotation table, a unit initial state table, a unit designated state table, a unit power constraint table, a unit standby constraint table, a unit electric quantity constraint table, a unit adjustment capacity table and the like; the power plant data can comprise power plant basic tables, power plant calculation parameters, power plant power constraint tables, power plant electric quantity constraint tables and the like; the step hydropower unit data can comprise hydropower unit step relation tables, hydropower unit reservoir capacity water level parameter tables, hydropower unit history state tables, hydropower unit water level constraint tables and other hydropower unit data.
According to the embodiment, through the mode of standardized definition of the input and output interfaces of the water discarding scheduling model, the water discarding scheduling efficiency of the cascade hydroelectric unit is improved, and the cascade hydroelectric unit is guaranteed to fully and reasonably utilize water resources.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a water discarding scheduling device considering the cascade hydroelectric water discarding flow limit, which is used for realizing the water discarding scheduling method considering the cascade hydroelectric water discarding flow limit. The implementation of the solution provided by the device is similar to the implementation described in the above method, so the specific limitation in the embodiment of the water-discarding scheduling device considering the cascade water-discarding flow limit provided below can be referred to the limitation of the water-discarding scheduling method considering the cascade water-discarding flow limit hereinabove, and will not be repeated here.
In one embodiment, as shown in FIG. 4, there is provided a water reject scheduling apparatus considering cascade water reject flow limitation, the apparatus 400 comprising:
the scheduling model construction module 410 is configured to construct a water-discarding scheduling model under the premise of considering the cascade hydroelectric water-discarding flow limit and a preset decision variable;
the objective function building module 420 is configured to build an objective function of the water-discarding scheduling model based on the multidimensional hydropower objective demand parameter;
a constraint condition determining module 430, configured to determine constraint conditions of the water-discarding scheduling model with respect to reservoir capacity balance and water-discarding requirements of the step hydroelectric units as targets;
an input data acquisition module 440, configured to acquire system load balance requirement data, unit data, power plant data, and step hydropower unit data, as input data of the water-discarding scheduling model;
and the scheduling result output module 450 is used for solving the water discarding scheduling model based on the input data to obtain a water discarding scheduling result considering the cascade hydroelectric water discarding flow limit.
In one embodiment, the objective function building module 420 is specifically configured to build an objective function of the safety restraint unit combination model by adopting the following expression on the premise of meeting the requirements of the minimization of the total online purchase electricity cost and the safe operation of the power grid and achieving the clean energy consumption goal:
Wherein N is the total number of units; j is the total number of the step hydroelectric units; t is the total number of time periods to be considered; p (P) i，t The output of the unit i in the period t; c (C) i，t (P i，t ) The method comprises the steps of providing running cost of a unit i in a period t, wherein the running cost is a multi-section linear function related to each section of output interval and corresponding energy price declared by the unit;the starting cost of the unit i in the period t is set; m is M 1 Relaxing penalty factors for network power flow constraints for water discard scheduling optimization; m is M 2 A discard electricity penalty factor for discard scheduling optimization; />Is the forward power flow relaxation variable of line l; />A reverse power flow relaxation variable of the line l; NL is the total number of lines; />Is the forward power flow relaxation variable of the section s; />Is the reverse power flow relaxation variable of the section s; NS is the total number of sections.
In one embodiment, the constraint condition determining module 430 is specifically configured to determine a hydropower level control constraint condition of the water-discarding scheduling model with the dynamic balance of the reservoir water volume as a target; and determining the water discarding flow limit constraint condition of the water discarding scheduling model by taking the actual water discarding habit of the step hydroelectric unit as a target.
In one embodiment, the constraint condition determining module 430 is further configured to determine a hydropower level control constraint condition of the water-abandoning scheduling model by using the following expression with the goal of dynamically balancing the reservoir water volume:
Wherein,a lower limit of the water level control requirement of the step hydroelectric unit i at the end of the period t, which is determined by the water regulation; />The upper limit of the water level control requirement of the step hydroelectric unit i at the end of the period t is determined by water regulation; z is Z i，0 The initial water level of the step hydroelectric unit i at the zero point of the next day; i i，τ The natural inflow water flow of the step hydroelectric unit i in the period tau is obtained; up (i) represents the upstream step hydropower unit of the step hydropower unit i; s (i) represents the upstream lag time faced by the step hydroelectric unit i;generating flow for the upstream step hydropower unit up (i) of the step hydropower unit i in the period t-s (i);the reject flow for the upstream step hydropower unit up (i) of the step hydropower unit i in the period t-s (i).
In one embodiment, the constraint condition determining module 430 is further configured to determine a water discharge rate constraint condition of the water discharge scheduling model by using the following expression with the goal of conforming to an actual water discharge habit of the step hydropower unit:
/>
wherein Z is i，t，end For the water level of the step hydroelectric unit i at the end of the period t,the upper limit of the water level control requirement of the step hydroelectric unit i at the end of the period t is determined by water regulation; />The water flow rate of the step hydroelectric unit i in the period t is obtained; beta i，t Represents an integer variable with a value of 0 or 1, when beta i，t When=1, the flow rate of the waste water which is allowed to be generated by the step hydroelectric unit i in the period t is represented as beta i，t When=0, the water flow rate of the step hydroelectric unit i is 0 in the period t; m is any extremely positive number.
In one embodiment, in the above apparatus, the step hydropower unit data comprises a step hydropower unit data table; the water disposal dispatching result comprises a system load balance table, a unit winning power table, a power plant winning power schedule and a cascade hydroelectric unit water disposal table.
The various modules in the above-described water discard scheduling apparatus considering step water discard flow limitation may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 5. The computer device includes a processor, a memory, an Input/Output interface (I/O) and a communication interface. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface is connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer equipment is used for storing data such as data related to the water abandoning scheduling. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for communicating with an external terminal through a network connection. The computer program, when executed by the processor, implements a water reject scheduling method that takes into account cascade hydro-electric water reject flow restrictions.
It will be appreciated by those skilled in the art that the structure shown in FIG. 5 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the method embodiments described above when the computer program is executed.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, implements the steps of the method embodiments described above.
In an embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the method embodiments described above.
It should be noted that, the user information (including but not limited to user equipment information, user personal information, etc.) and the data (including but not limited to data for analysis, stored data, presented data, etc.) related to the present application are information and data authorized by the user or sufficiently authorized by each party, and the collection, use and processing of the related data need to comply with the related laws and regulations and standards of the related country and region.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.
Claims (10)
1. A water reject scheduling method taking into account cascade hydroelectric reject flow limitation, the method comprising:
under the premise of considering the cascade hydroelectric waste water flow limit and a preset decision variable, a waste water scheduling model is constructed;
establishing an objective function of the water discarding scheduling model based on the multidimensional hydroelectric objective demand parameters;
determining constraint conditions of the water discarding scheduling model by taking reservoir capacity balance and water discarding requirements of the cascade hydroelectric units as targets;
Acquiring system load balance demand data, unit data, power plant data and step hydropower unit data as input data of the water discarding scheduling model;
solving the water discarding scheduling model based on the input data to obtain a water discarding scheduling result considering cascade hydroelectric water discarding flow limit;
the constraint conditions comprise a hydropower water level control constraint condition and a water discharge flow limit constraint condition; the reservoir capacity balance comprises reservoir water quantity dynamic balance; the step hydroelectric unit water discarding requirement comprises the actual water discarding habit of the step hydroelectric unit;
the constraint condition of the water discarding scheduling model is determined by taking reservoir capacity balance and cascade hydroelectric unit water discarding requirements as targets, and the constraint condition comprises the following steps:
determining a hydropower level control constraint condition of the water discarding scheduling model by taking the dynamic balance of the reservoir water quantity as a target;
aiming at conforming to the actual water discarding habit of the step hydroelectric unit, determining a water discarding flow limit constraint condition of the water discarding scheduling model by adopting the following expression;
wherein Z is i，t，end For the water level of the step hydroelectric unit i at the end of the period t,the upper limit of the water level control requirement of the step hydroelectric unit i at the end of the period t is determined by water regulation; / >The water flow rate of the step hydroelectric unit i in the period t is obtained; beta i，t Represents an integer variable with a value of 0 or 1, when beta i，t When=1, the flow rate of the waste water which is allowed to be generated by the step hydroelectric unit i in the period t is represented as beta i，t When=0, the water flow rate of the step hydroelectric unit i is 0 in the period t; m is any extremely positive number.
2. The method of claim 1, wherein the multi-dimensional hydroelectric target demand parameters include a total online purchase electricity cost demand parameter, a grid safe operation demand parameter, and a clean energy consumption demand parameter; the total online shopping cost demand parameters comprise parameters for representing the minimization of the total online shopping cost; the clean energy consumption requirement parameters comprise parameters for representing a clean energy consumption target; the water discarding scheduling model comprises a safety constraint unit combination model;
the establishing the objective function of the water discarding scheduling model based on the multi-dimensional hydroelectric objective demand parameters comprises the following steps:
on the premise of meeting the requirements of the minimization of the total online shopping cost and the safe operation of the power grid and achieving the clean energy consumption target, the following expression is adopted to establish an objective function of the safe constraint unit combination model:
Wherein N is the total number of unitsThe method comprises the steps of carrying out a first treatment on the surface of the J is the total number of the step hydroelectric units; t is the total number of time periods to be considered; p (P) i，t The output of the unit i in the period t; c (C) i，t (P i，t ) The method comprises the steps of providing running cost of a unit i in a period t, wherein the running cost is a multi-section linear function related to each section of output interval and corresponding energy price declared by the unit;the starting cost of the unit i in the period t is set; m is M 1 Relaxing penalty factors for network power flow constraints for water discard scheduling optimization; m is M 2 A discard electricity penalty factor for discard scheduling optimization; />Is the forward power flow relaxation variable of line l; />A reverse power flow relaxation variable of the line l; NL is the total number of lines;is the forward power flow relaxation variable of the section s; />Is the reverse power flow relaxation variable of the section s; NS is the total number of sections; />For the reject flow of the unit i in the period t.
3. The method of claim 1, wherein said determining a hydropower level control constraint of said discard scheduling model targeting said reservoir volume dynamic balance comprises:
and determining a hydropower level control constraint condition of the water discarding scheduling model by taking the dynamic balance of the reservoir water quantity as a target and adopting the following expression:
Wherein,a lower limit of the water level control requirement of the step hydroelectric unit i at the end of the period t, which is determined by the water regulation;the upper limit of the water level control requirement of the step hydroelectric unit i at the end of the period t is determined by water regulation; z is Z i，0 The initial water level of the step hydroelectric unit i at the zero point of the next day; i i,t The natural inflow water flow of the step hydroelectric unit i in the period t is obtained; up (i) represents the upstream step hydropower unit of the step hydropower unit i; s (i) represents the upstream lag time faced by the step hydroelectric unit i;generating flow for the upstream step hydropower unit up (i) of the step hydropower unit i in the period t-s (i);the water reject flow of the upstream step hydropower unit up (i) of the step hydropower unit i in the period t-s (i); />Generating flow for the step hydroelectric unit i in a period t; />For the reject flow of the hydro-power unit i in period t; s is S i Is the water surface area of the reservoir; p (P) i,t The output power of the hydroelectric unit i in the period t is given; h is a i Is the water consumption rate parameter of the hydroelectric unit i.
4. A method according to any one of claims 1 to 3, wherein the step hydroelectric cell data comprises a step hydroelectric cell data sheet; the water disposal dispatching result comprises a system load balance table, a unit winning power table, a power plant winning power schedule and a cascade hydroelectric unit water disposal table.
5. A water reject scheduling device that considers cascade hydroelectric reject flow limitation, the device comprising:
the scheduling model construction module is used for constructing a water discarding scheduling model under the premise of considering the cascade hydroelectric water discarding flow limit and a preset decision variable;
the objective function building module is used for building an objective function of the water discarding scheduling model based on the multidimensional hydropower objective demand parameters;
the constraint condition determining module is used for determining constraint conditions of the water discarding scheduling model by taking reservoir capacity balance and water discarding requirements of the step hydroelectric units as targets;
the input data acquisition module is used for acquiring system load balance demand data, unit data, power plant data and step hydropower unit data and is used as input data of the water discarding scheduling model;
the scheduling result output module is used for solving the water discarding scheduling model based on the input data to obtain a water discarding scheduling result considering the cascade hydroelectric water discarding flow limit;
the constraint conditions comprise a hydropower water level control constraint condition and a water discharge flow limit constraint condition; the reservoir capacity balance comprises reservoir water quantity dynamic balance; the step hydroelectric unit water discarding requirement comprises the actual water discarding habit of the step hydroelectric unit;
The constraint condition determining module is used for determining a hydropower level control constraint condition of the water discarding scheduling model by taking the dynamic balance of the reservoir water quantity as a target;
the constraint condition determining module is further used for determining a water discarding flow limit constraint condition of the water discarding scheduling model by adopting the following expression with the aim of conforming to the actual water discarding habit of the step hydroelectric unit;
wherein Z is i，t，end For the water level of the step hydroelectric unit i at the end of the period t,the upper limit of the water level control requirement of the step hydroelectric unit i at the end of the period t is determined by water regulation; />The water flow rate of the step hydroelectric unit i in the period t is obtained; beta i，t Represents an integer variable with a value of 0 or 1, when beta i，t When=1, the flow rate of the waste water which is allowed to be generated by the step hydroelectric unit i in the period t is represented as beta i，t When=0, the water flow rate of the step hydroelectric unit i is 0 in the period t; m is any extremely positive number.
6. The apparatus of claim 5, wherein the multi-dimensional hydroelectric target demand parameters include a total online purchase electricity cost demand parameter, a grid safe operation demand parameter, and a clean energy consumption demand parameter; the total online shopping cost demand parameters comprise parameters for representing the minimization of the total online shopping cost; the clean energy consumption requirement parameters comprise parameters for representing a clean energy consumption target; the water discarding scheduling model comprises a safety constraint unit combination model;
The objective function building module is used for building the objective function of the safety constraint unit combination model by adopting the following expression on the premise of meeting the requirements of the minimization of the total online purchase electricity cost and the safe operation of the power grid and achieving the clean energy consumption target:
wherein N is the total number of units; j is the total number of the step hydroelectric units; t is the total number of time periods to be considered; p (P) i，t The output of the unit i in the period t; c (C) i，t (P i，t ) The method comprises the steps of providing running cost of a unit i in a period t, wherein the running cost is a multi-section linear function related to each section of output interval and corresponding energy price declared by the unit;the starting cost of the unit i in the period t is set; m is M 1 Relaxing penalty factors for network power flow constraints for water discard scheduling optimization; m is M 2 A discard electricity penalty factor for discard scheduling optimization; />Is the forward power flow relaxation variable of line l; />A reverse power flow relaxation variable of the line l; NL is the total number of lines;is the forward power flow relaxation variable of the section s; />Is the reverse power flow relaxation variable of the section s; NS is the total number of sections; />For the reject flow of the unit i in the period t.
7. The apparatus of claim 5, wherein the constraint condition determination module is further configured to determine a hydropower level control constraint condition of the discard scheduling model, targeting the reservoir water volume dynamic balance, using the following expression:
Wherein,a lower limit of the water level control requirement of the step hydroelectric unit i at the end of the period t, which is determined by the water regulation;the upper limit of the water level control requirement of the step hydroelectric unit i at the end of the period t is determined by water regulation; z is Z i，0 The initial water level of the step hydroelectric unit i at the zero point of the next day; i i,t The natural inflow water flow of the step hydroelectric unit i in the period t is obtained; up (i) represents the upstream step hydropower unit of the step hydropower unit i; s (i) represents the upstream lag time faced by the step hydroelectric unit i;generating flow for the upstream step hydropower unit up (i) of the step hydropower unit i in the period t-s (i);the water reject flow of the upstream step hydropower unit up (i) of the step hydropower unit i in the period t-s (i); />Generating flow for the step hydroelectric unit i in a period t; />For the reject flow of the hydro-power unit i in period t; s is S i Is the water surface area of the reservoir; p (P) i,t The output power of the hydroelectric unit i in the period t is given; h is a i Is the water consumption rate parameter of the hydroelectric unit i.
8. The apparatus of any one of claims 5 to 7, wherein the step hydroelectric cell data comprises a step hydroelectric cell data sheet; the water disposal dispatching result comprises a system load balance table, a unit winning power table, a power plant winning power schedule and a cascade hydroelectric unit water disposal table.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 4 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 4.
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